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A291089
a(n) = A026520(2n+1).
3
1, 4, 20, 104, 556, 3032, 16778, 93872, 529684, 3008864, 17184188, 98577712, 567591142, 3278348608, 18986482250, 110217131168, 641125473092, 3736134109936, 21807240851480, 127469052615104, 746057665449076, 4371699398312704, 25644387465768860
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A035028 A104550 A089382 * A192619 A026305 A195256
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 19 2017
EXTENSIONS
a(15)-a(22) from Lars Blomberg, Sep 01 2017
STATUS
approved